You seem to be offended when no offense was intended. No where did the OP indicate that this rule applied to Critical business use. JSON parsing is almost never

You seem to be offended when no offense was intended. No where did the OP indicate that this rule applied to Critical business use. JSON parsing is almost never a critical business use case. And I don't know about you but these days hosting a public facing internet service is increasingly like a battle DDOS, Data Loss, State sponsored APT's. I certainly don't feel macho about my work. I don't author many libraries that are used by a public facing service on the internet so I have nothing to beat my chest about. I do however use libraries that have been written by someone else and had the bugs shaken out by years of continuous use in a hostile environment. It's not a perfect guarantee but it's certainly better than something I wrote this month. In most cases a library that has been in continuous use for several years on large public facing services will have been much more tested than anything you might write. Not because you aren't skilled enough but because the edge cases are unbounded and you can't think of everything.